[petsc-users] Matrix Factorization fill

[Rongliang Chen]

Hi,

I have a question about the Sparse Matrix Factorization fill.
Following the manual, I use the option "-info" and get the following result:

[0] MatLUFactorSymbolic_SeqAIJ(): Reallocs 0 Fill ratio:given 5 needed
5.0746e-05
[0] MatLUFactorSymbolic_SeqAIJ(): Run with -pc_factor_fill 5.0746e-05 or use
[0] MatLUFactorSymbolic_SeqAIJ(): PCFactorSetFill(pc,5.0746e-05);

What's the numbers mean in "Reallocs 0 Fill ratio:given 5 needed
5.0746e-05"?
Does the " Run with -pc_factor_fill 5.0746e-05 or use" mean that I should
run my code with option " -pc_factor_fill 5.0746e-05"?

But when I run my code with option "-snes_view", I get "factor fill ratio
given 5, needed 3.28701".
So what should I give to the option "-pc_factor_fill", 3.28701 or
5.0746e-05? Thanks.

Best,
Rongliang
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